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Wires P and Q have the same resistance at ordinary (room) temperature. When heated, resistance of P increases and that
of Q decreases. We conclude that

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P and Q are conductors of different materials

P is n-type semiconductor and Q is p-type semiconductor

P is semiconductor and Q is conductor

P is conductor and Q is semiconductor

answer is D.

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Detailed Solution

A conductor has positive temperature coefficient of resistance, but a semiconductor has negative temperature coefficient of resistance.

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